Merge "Revert "Temporarily disable checkstyle hook"" into rvc-dev am: d9df6c3024 am: 40a4041221 am: 41a4b3c039 am: 4cec7bf73a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/12129283

Change-Id: Icfb82d96e2cc88dfce0556f6ae9fb2c73713c091